JPH0468013A - Resin composition for injection molding and production of molding therefrom - Google Patents

Abstract

PURPOSE:To obtain the title composition which can give a molding having excellent mold release and coatability by using a specified resin composition wherein the internal mold release comprises a specified imide compound. CONSTITUTION:A resin composition comprising an aliphatic, alicyclic or aromatic polyisocyanate (A), a polyol or prim., sec. or aromatic prim. amino- terminated polyester (B) having at least two active hydrogen groups and a molecular weight of 8,000-12,000, 5-80pts.wt., per 100pts.wt. polyol or polyether of component B, aromatic diamine chain extender (C) and an internal mold release (D), and having an isocyanate index of 70-130, wherein component D is an amide compound of formula I [wherein R is an 8-24 C aliphatic (un)saturated hydrocarbon group; and A1 is an aliphatic, alicyclic or aromatic tetravelent group], formula II [wherein R3 is R; and R1 and R2 are each a 1-24 C (un)saturated hydrocarbon group] or formula III [wherein R4 is R; A2 is an (un)saturated hydrocarbon group; aliphatic or aromatic group and is a bivalent group all or part of whose constituting atoms constitute a six- or five-membered cyclic imide group].

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides polyurethane/polyurea or polyurea molded products having excellent mold release properties and paintability using an internal mold release agent having an aliphatic imide as a substrate. A resin composition for injection molding that is manufactured using the reaction injection molding method (hereinafter abbreviated as RIM method)! I
The present invention relates to IFI and a method for producing a resin molded product made from it.

(Prior Art) The RI'M method, which is one of the methods for molding polyurethane/polyurea or polyurea molded products, is an important manufacturing method for manufacturing external parts of automobile bodies and other thermosetting resin molded products. be.

The RIM method is an injection molding method in which the active hydrogen component and the polyisocyanate component are thoroughly mixed, and then this mixture is rapidly hardened and molded in a mold.
This is a one-shot J molding method.

For the production of polyurethane/polyurea elastomers or polyurea elastomers by this method,
Several methods have been disclosed as described below.

Specifically, Japanese Patent Publication No. 54-17359 discloses that 1-methyl-3,5-diethyl-2,4-diaminobenzene and 1-methyl-3,5-diethyl-2,
A polyurethane characterized in that an aromatic diamine consisting of 6-diaminobenzene or a mixture of isomers having a weight ratio of about 8020 (hereinafter referred to as DETDA) is used as a chain extender.
A method for producing polyurea elastomers is disclosed.

In addition, U.S. Patent No. 4,396,729 discloses polyether having an amino group at the end and DETDA as active hydrogen compounds.
A method for producing polyurethane/polyurea elastomers is disclosed. All of them are molded using the RIM method, and the resulting molded product is generally placed in a mold with 20 to 3
It is cured and released from the mold in a short period of about 0 seconds. In this method, it is important from the viewpoint of productivity that the molded product can be easily molded from the mold.

Various internal mold release agents have been disclosed to achieve these objectives.

These internal mold release agents are added to the resin composition, and as a result, the resulting molded product has weaker adhesion to the mold surface than when it does not contain the internal mold release agent.

As an internal mold release agent used in polyurethane molding, West German Publication 19535:17 states that when producing polyurethane foam with a dense outer skin and a foam-like core in a mold,
As internal mold release agents, salts of aliphatic carbonic acids and primary amines or salts of amines having amide and/or ester groups containing a total of 25 or more carbon atoms are mentioned.

Further, West German Publication No. 2121670 discloses that when producing a polyurethane foam with a dense outer skin and a foam-like core in a mold, an internal mold release agent having an aliphatic carbon atom of 020 or more and an amide and/or salts of amines with ester groups and aliphatic carbonic acids, ■ esters of monofunctional and/or polyfunctional carbonic acids, esters with CO and/or esters, ■ oils, natural or synthetic. , a mixture of two or more selected from fats or waxes.

European Patent Application Publication No. 153639 describes the use of a mixture of montanic acid and an aliphatic carbonic acid having 10 or more carbon atoms as an internal mold release agent in the one-shot production of polyurethane/polyurea elastomers or foams. Examples include carboxylic acid esters and/or carboxylic acid amides obtained by esterification and/or amidation with one or more polyols, alkanolamines, or polyamines having a molecular weight of 60 to 400.

Also, EPC patent output publication +80749, 0.8 ~
], an internal mold release agent when producing a polyurethane elastomer having an average density of 4 g/cm', an average molecular weight of 900 produced from 3 to 15 moles of ricinoleic acid and 1 mole of monohydric or polyhydric alcohol. ~4500, esters with a dairy value of 5 or less, and an 011 value of 12.5 to 125.

However, the internal mold release agents in the above-mentioned literature generally have poor mold release effects in formulations that use primary aromatic diamines as chain extenders. Further, when an internal mold release agent having a carboxyl group and a general urethanization catalyst are used together, the catalytic reaction is inhibited, and a satisfactory molded product cannot be obtained, and its mechanical strength is also inferior.

WO84103288 describes the use of one or more types of release agents when producing polyurethane elastomers by the RIM method.
One or more carbonic acids, phosphoric acids, or boric acid metal salts are used in a ratio of 1 part by weight or less per 2 parts by weight of an active hydrogen-containing substance having a primary amino group and/or a secondary amino group. Although the mold releasability can be improved according to the technology, the coating performance deteriorates, for example, 1,1.1-
) - There were problems such as poor adhesion when the coating was washed with dichloroethane solvent. This is because the solubility of the above-mentioned acid metal salts in 1,1,1-trichloroethane is extremely low, making it impossible to wash them thoroughly. Therefore, industrially, cleaning methods that use large amounts of acid or alkaline water are used, and the equipment used for the cleaning and drying processes becomes excessively large, resulting in high costs.

(Problem to be Solved by the Invention) The technical problem of the present invention is to solve the above-mentioned drawbacks and to create a resin composition for injection molding of polyurethane/polyurea and polyurea using an internal molding agent that can continuously produce molded products. An object of the present invention is to provide a method for manufacturing a product and a molded product made from the product.

[Means to solve problems]

The present invention relates to polyurethane/polyurea and polyurea resin compositions having excellent mold release properties and paintability using an internal mold release agent having an aliphatic imide as a substrate, and a method for producing molded products made from the same. .

That is, the present invention provides (a) an aliphatic, alicyclic and/or aromatic polyisocyanate (b) having two or more active hydrogen groups and having a molecular weight of 800 to 1
2000 polyol or a polyether whose terminal end is substituted with a primary amino group, a secondary amino group or an aromatic primary amino group (c) 100 parts by weight of the polyol or polyether of component (b) above On the other hand, if a resin composition containing a chain extender containing 5 to 80 parts by weight of an aromatic diamine and (d) an internal mold release agent and having an incyanate index of 70 to 130 is used, Internal mold release agent or the following formula (
A resin composition for injection molding characterized by being an imide compound represented by I), (II) or (m).

(In the formula, R represents an aliphatic saturated or unsaturated hydrocarbon group of 08 to C24, and A1 represents a tetravalent group that is an aliphatic group, an alicyclic group, or an aromatic group.) ♂ (Formula In the formula, R represents a C8 to C24 aliphatic saturated or unsaturated hydrocarbon group, R,, R2 represents a C8 to C24 saturated or unsaturated hydrocarbon group. aliphatic saturated or unsaturated hydrocarbon group, A2 is a saturated or unsaturated hydrocarbon group, alicyclic group or aromatic group, all or part of which is 6
Alternatively, it represents a divalent group forming a cyclic imide having 5 ring atoms. ) The production method of the present invention comprises (a) an aliphatic, alicyclic and/or aromatic polyisocyanate (b) having two or more active hydrogen groups and having a molecular weight of 800 to 1
2000 polyol, or a polyether whose terminal end is substituted with a primary amino group, a secondary amino group, or an aromatic primary amine group, (c) 100 parts by weight of the polyol or polyether of component (b) above. , a chain extender containing 5 to 80 parts by weight of an aromatic diamine, and (d) an internal mold release agent, in which the resin composition has an incyanate index of 70 to 130. The molding agent or the above formula (
This is a method for producing a resin molded article, which comprises molding a resin composition which is an imide compound represented by I), (II) or (m) using a reaction injection molding method.

The present invention includes a resin composition for injection molding, characterized in that the imide compound is used in an amount of 0.5 to 0 parts by weight per 100 parts by weight of the polyol or polyether as component (b).

Further, the production method of the present invention can be used to prepare an imide compound or the above (b)
It includes a method for producing a resin molded article, characterized in that the resin is used in an amount of 0.5 to 10 parts by weight per 100 parts by weight of the component polyol or polyether.

The aliphatic imide compound used as the internal mold release agent of the present invention includes a saturated or unsaturated aliphatic primary amine having 8 to 24 carbon atoms, an aliphatic, alicyclic or aromatic acid anhydride, and a carboxylic acid. Or obtained by reaction with acid chloride.

Preferred compounds are obtained by reaction of aliphatic (8 to 24 carbon atoms) primary amines with acid anhydrides.

More preferable compounds of formula (I) include the above-mentioned carbon number 8
~24 saturated or unsaturated aliphatic primary amines and pyromellitic anhydride, methanetetracarboxylic anhydride, or naphthalene-1,4,5,8-tetracarboxylic acid anhydride, etc. , or a mixture of these may be used. Further, more preferable compounds of formula (TI) or formula (II[) include the above-mentioned saturated or unsaturated aliphatic primary amine having 8 to 24 carbon atoms, maleic anhydride, succinic anhydride, and phthalic anhydride. It can be obtained by reacting with, etc., and these may also be used as a mixture.

The amount of internal mold release agent used as component (cl) is preferably 0.5 to IO parts by weight per 100 parts by weight of component (b). Most preferably, it is used in an amount of 0.5 to 5 parts by weight. If the amount is less than 0.5 parts by weight, the mold releasability will deteriorate, and if it is used in excess of 10 parts by weight, the effect of improving the tll type property will be small and this will be disadvantageous in terms of cost.

As the polyisocyanate of component (a), known aliphatic, alicyclic or aromatic polyisocyanates are used, and specifically, for example, 4,4'-diphenylmethane diisocyanate, 2,4- and/or 2.4'-diphenylmethane diisocyanate. 6-1 ~ Relene cyisocyanate Polymethylene polyphenyl polyisocyanate, xylylene cyisocyanate, isophorone diisocyanate, other aliphatic polyisocyanates, or dimers, trimers, carbodiimide modified products, preforms of these incyanates Examples include polymers. Aromatic polyisocyanates, including those that are liquid at room temperature, are particularly preferred; specific examples include 4,4'-diphenylmethane diisocyanate, mixtures of this substance and its homologues, and polyisocyanates containing polyfunctional hydroxyl groups. Preferred is a modified isocyanate that is reacted with a compound or modified by carbodiimidation.

(b) Component polyols include, for example, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, chrycerin, trimethylolpropane, 1,3.6-
Examples include polyether polyols obtained by addition polymerizing alkylene oxide to polyhydric alcohols such as hexandriol, pentaerythritol, and sorbitol, or polyhydroxy compounds thereof. In addition, alkanolamines such as jetanolamine and towaethanolamine, amines having two or more active hydrogens such as ethylene diamine, diethylene triamine, ammonia, aniline, tolylene diamine xylylene diamine, diaminodiphenylmethane, ethylene oxide, propylene oxide, Polyether polyols or polytetramethylene ether glycols obtained by addition polymerizing styrene oxide or the like may also be used. In addition to the above, there are also polyester polyols obtained by reacting higher fatty acid ester polyols or polycarboxylic acids with low molecular weight polyols, polyester polyols or polycarbonate polyols obtained by polymerizing caprolactone, and higher polymers having hydroxyl groups such as castor oil or dehydrated castor oil. Fatty acid esters and the like can also be used. Furthermore, polymer polyols obtained by craft-reacting the above-mentioned known polyols with ethylenically unsaturated compounds such as styrene, acrylonitrile, and methyl methacrylate, 1.2- or 1.4-polyphtadiene polyols, or hydrogenated products thereof can also be used. These can be used alone or in a mixture of two or more.

In addition, as an example of the polyether of component (b), the above (
Polyethers in which the terminals of the polyols of component b) are substituted with a primary amino group, a secondary amino group, or an aromatic primary amino group are used.

A preferred example is Taxaco's Jaffamine T-5, described in U.S. Pat. No. 4,396,729.
000, [1-2000, a polyoxyalkylene ether polyol with a hydroxyl value of 28 mg KOH/H and diisopropylamine described in JP-A No. 64-81816 were reacted under hydrogen pressure using a catalyst and had a molecular weight of 600 N. -(Polyoxyalkyl)-N-(alkyl)amine and NGO-preatact prepared from tolylene-2,4-diisocyanate and polypropylene glycol ether (average molecular weight 2000) described in JP-A-58-41857. (NCO value 3.4%)
Nl monovalent 44J obtained by hydrolyzing by the above method [
KOH (mg)/g], acid value 0.1 [KOH (mg)
/g], molecular weight 2500, viscosity i ([Opa,s: 75
Examples include polyoxyalkylene ether polyols having an amino group at the end (°C).

The aromatic diamine of component (c) is an aromatic diamine having one or more alkyl substituents in the position ortho to the amino group, especially an aromatic diamine having one or more alkyl substituents in the ortho position to the primary amino group. and having 1 to 4 carbon atoms each in the ortho position to the second amino group
It is an aromatic primary diamine having 5 alkyl substituents.

Examples of preferred aromatic diamines include 2,4-diaminomesitylene, 1,3. S-triethyl-2,4-diaminohensen, 1,3.5-triisopropyl-2,
4 Diaminohensen, ■-Methyl-3,5-diethyl 2
．． 4-diaminobenzene, ■-methyl-3,5-diethyl-2,6-diaminohensen, 4,6-dimethyl-2
-ethyl-1,3-diaminohensen, 3,5.3',
5'-tetraisopropyl-4,4'-diaminodiphenylmethane, 3,5-diethyl-3', 5-diisopropyl-4,4'-diaminodiphenylmethane, 1,3-
Dimethyl-5-t-4,5-diaminobenzene or 1,3-dimethyl-5-t-2,6-diamino-hensen, 1-methyl-5-t-2,4-diaminobenzene or 1 -methyl-3-tert-butyl-2,6-diaminohensen, 5,7-diamino1.1,4.6-titramethylintane or mixtures of such diamines are preferred.

1-methyl-3,5-diethyl-2,4-diaminobenzene and 1-methyl-3,5-diethyl-2,
The amount of the aromatic diamine of component (c), which is particularly preferred as a mixture with 6-diaminohensen and 5,7-diamyto-1,1,4,6-titramethylintane, is based on the polyol or polyether of component (b). Approximately 5 per 100 parts by weight
~80 parts by weight is preferred. It is particularly preferably used in an amount of 8 to 30 parts by weight.

Other additives used in the present invention include catalysts that promote polyaddition reactions between isocyanates and incyanate-reactive groups. Catalysts include, in particular, tin salts of carboxylic acids, dialkyltin salts of carbonic acids, dialkyltin mercaptides, dialkyltin dithioesters and tertiary amines.

As other additives, a foaming agent such as a foam stabilizer typified by polydimethylpolysiloxane, water and/or a volatile organic substance and/or a dissolved inert gas may be used.

An example of producing an internal mold release agent is shown below.

(The parts shown below indicate parts by weight.) Production Example 1 (Internal mold release agent-1) 259.5 parts of stearylamine and 500 parts of DMF were placed in a 3-inch reactor and heated to 50 to 60°C. A solution prepared by dissolving 120 parts of pyromellitic anhydride in 600 parts of DMF is added dropwise under stirring. A white solid (amic acid) precipitates out.

Triethylamine 48.0 parts, magnesium oxide 2.0
0.2 parts of cobalt acetate tetrahydrate are added. Then, 10.0 parts of anhydrous vinegar @l was added dropwise, and after the addition was completed, the internal temperature was heated to 130°C, and the reaction was allowed to continue for 6 hours.

After cooling, the crystals are filtered off, washed with water, and dried. Melting point 13
310 g of brown flakes at 0°C were obtained. This one is TR
Two tree absorptions at 1780 cm-' and 1720 cl' were detected in the spectrum, and Mw=720 was detected in the mass spectrum, confirming that it was stearylpyromellitic acid imide.

Production Example 2 (Internal Mold Release-2) Stearylcarboxylic imide was obtained in the same manner as in Production Example 1, using 99 parts of phthanetetracarphonic anhydride instead of pyromellitic anhydride in Production Example 1. .

Production Example 3 (Internal mold release agent-3) Naphthalene was used instead of pyromellitic anhydride in Production Example 1.
Stearylnaphthalenetetracarphonimide was obtained in the same manner as in Production Example 1 using 134 parts of 1,4,5,8-tetracarboxylic anhydride.

Production example 4 (internal mold release agent-4) 2 units with stirrer, thermometer, refrigeration device, and dropping funnel) ~
269.5 parts of stearylamine and 1078 parts of acetone were charged into a reactor of 100 ml. Separately, a solution was prepared by dissolving 98 parts of maleic anhydride in 98 parts of acetone.
~30°C). A yellow solid (amic acid) precipitates out.

269.5 parts of triethylamine 4 # magnesium compound 2.
0 parts and 0.2 parts of cobalt acetate tetrahydrate are added. Thereafter, 130.0 parts of acetic anhydride was added dropwise, and after the completion of the dropwise addition, the internal temperature was heated to 55°C, and the mixture was heated and stirred for 4 hours.

After cooling, the brown solution is poured into 1500 parts of water, and the precipitated crystals are filtered off, washed with water, and dried. 220 g of brown powder with a melting point of 72°C was obtained.

From IH-NMR, this product was found to be δ-6 derived from a cyclic imide.
, 85 (singlet), and it was recognized that it had the following structure.

Also, the infrared absorption spectrum (TR spectrum) is 330
The absorption of Nl (of the amide at 0 cm-' disappears, 178
It was confirmed that two imides were absorbed at 0 cm-' and 1720 cm-'.

Production Example 5 (Internal mold release agent-5) In a 2-liter reactor equipped with a stirrer, thermometer, cooler, and dropping funnel, 300 parts of stearylfuromite and DM were added.
Charge 1200 parts of F, and gradually add 177.8 parts of potassium phthalimide powder while stirring. Thereafter, the internal temperature was heated to 120°C, and heating and stirring was continued for 4 hours. After cooling, the contents are filtered, and the filtered mass is washed with 0.2N caustic sorter solution, water, and ethanol in this order, and then dried.

343 g of white powder with a melting point of 83°C was obtained.

Production Example 6 (Internal mold release agent-6) Succinic anhydride 10 was used instead of maleic anhydride in Production Example 4.
Stearyl succinimide was obtained by using 0 parts and operating in the same manner as in Production Example 1.

〔Example〕

The present invention will be specifically explained below with reference to Examples, but the present invention is not limited thereto.

The components used in the following Examples and Comparative Examples are as follows.

■Internal mold release agent (1) to (6); Internal mold release agent -1 to 6
■Polyol A: EP-33ON manufactured by Mitsui Toatsu Ka'$. Hydroxyl number (011 value) is 34, contains about 85% propylene oxide, and has about 15% ethylene oxide at the end. ) Polyether triol ■Polyether B having an amine group at the end: Jeffamin manufactured by Taxaco
e-D-2000 ■ Chain extender C; Ethyl-cor
Aircure 1001, manufactured by P Company, manufactured by D Company, 3,5-diethyl-2,4-diaminobenzene and 1-methyl-3,5
Approximately ao of -diethyl-2,5-diaminohensen:
Isomer mixture of zo ■ Chain extender.

5.7~Diamino-1,1,4,5,-tetramethylintane ■Chain extender E Jef f manufactured by HTaxaco
amine-D-400 Polyether diamine with a terminal amino group and a molecular weight of 400 ■ Chain extender F, manufactured by Mitsui Toatsu Chemical ■ AE-300 08-valent 75 made by adding propylene oxide to ethylene diamine
0 polyether polyol ■Polyisocyanate G; Prepolymer made by reacting the top opening with len glycol and 4,4'-diphenylmethane diincyanate (MD I) NCO% = 22.5%, viscosity 800CPS/25°C■
Tin catalyst; 5tan BL manufactured by Tricovalent Vehicle; Situtiltin Silaurate [phase] Amine catalyst; DA manufactured by Air-Product.
BCO33L ■ Zinc stearate; Shinstearate GF-2000 paint Primer manufactured by NOF ■ Flexene-600pr manufactured by Bee-chemica 1
immertop coat; Flexene 105 manufactured by Bee-chea+ica 1 company
(White).

(Examples 1 to 15 and Comparative Examples 1 to 4) Polyols or polyethers A, B, chain extenders C, D, E, F and internal mold release agents (1) to (5), stearin, zinc and polyisocyanate Polyurethane elastomers were prepared using G as shown in Tables 1 to 3 under the following conditions.

That is, an active hydrogen compound (liquid A) whose main components are a polyol or polyether, a chain extender, an internal mold release agent, and a lubricant;
Incyanate (B) liquid is produced using a high-pressure foaming machine (Toho Kikai N R
-230) and mixed them in a high-pressure foaming machine, and then injected them into a simple bumper mold (
U-shaped, approximately 500cc volume, wall thickness (■).

Before injection, the surface of the mold was cleaned with DMF, and then an external mold release agent, D-186 wax manufactured by Chukyo Yushibai Co., Ltd., was applied by spraying.

In the mold releasability test, we actually investigated how many times the mold could be continuously released from the lower mold by applying one external mold release agent spray from a simple bumper mold.

Painting was carried out under the following conditions.

After 1hr of molding, post-curing was performed at 120°C for 30 minutes.

After post-curing, it was left at room temperature for 1 hour, and then washed and degreased using 1,1,1-trichloroethane (manufactured by Central Glass Co., Ltd.) Vapor. Flexen-600 primer was applied to the washed and degreased sample, and baked at 120°C for 20 minutes. Flexene-10 after being left at room temperature for 30 minutes
5 (white) Apply top coat and bake at 120
It was left at °C for 30 minutes.

The adhesion test for painted products was conducted under the following conditions.

For the cross-cut test, use a cutter knife to cut the painted product vertically and horizontally for 2+s.
After making 11 increments at m intervals and sticking them with cellophane tape,
A peel test was conducted.

Initial period: Divided test after painting, water resistance test, 80° C., Divided test after 240 hrs. The results of the dimpled test are shown as A/100. A] 00
Indicates the number of squares in (l!) that do not cause peeling.

Pass indicates 100/100.

The results of the examples are shown in Tables 2 and 3, and the comparative examples are shown in Table 1.

[Effects of the Invention] According to the present invention, it is possible to produce a molded product that exhibits an excellent mold release effect from a mold, contributes to a significant improvement in productivity, and has excellent paintability. This is an extremely useful invention.

teenager Reason Man

Claims (4)

[Claims] (1) (a) Aliphatic, alicyclic and/or aromatic polyisocyanate, (b) having 2 or more active hydrogen groups and a molecular weight of 800 to 1
2000 polyol, or a polyether whose terminal end is substituted with a primary amino group, a secondary amino group, or an aromatic primary amino group, (c) 100 parts by weight of the polyol or polyether of component (b) above. , a chain extender containing 5 to 80 parts by weight of an aromatic diamine, and (d) an internal mold release agent, in which the resin composition has an isocyanate index of 70 to 130; The agent is of the following formula [
A resin composition for injection molding, characterized in that it is an imide compound represented by [I], [II] or [II]. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [I] (In the formula, R represents an aliphatic saturated or unsaturated hydrocarbon group of C_8 to C_2_4, and A_1 is an aliphatic group, an alicyclic group, or an aromatic group. ) ▲There are mathematical formulas, chemical formulas, tables, etc. ▼ [II] (In the formula, R_3 is an aliphatic saturated or unsaturated hydrocarbon group of C_8 to C_2_4, and R_1 and R_2 are C_1 to C_
2_4 represents a saturated or unsaturated hydrocarbon group. ) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [III] (In the formula, R_4 is an aliphatic saturated or unsaturated hydrocarbon group of C_8 to C_2_4, A_2 is a saturated or unsaturated hydrocarbon group, alicyclic or refers to a divalent group that is aromatic and forms a cyclic imide, all or part of which has 6 or 5 ring atoms.) (2) (a) Aliphatic, cycloaliphatic and/or aromatic polyisocyanates. (b) Has 2 or more active hydrogen groups and has a molecular weight of 800 to 1
2,000 polyols, or polyethers whose ends are substituted with primary amino groups, secondary amino groups, or aromatic primary amino groups; (c) 100 weight polyols or polyethers as component (b) above; In a resin composition having an isocyanate index of 70 to 130, the resin composition contains a chain extender containing 5 to 80 parts by weight of an aromatic diamine, and (d) an internal mold release agent. The molding agent is of the following formula [
A method for producing a resin molded article, which comprises molding a resin composition which is an imide compound represented by [I], [II] or [III] by a reaction injection molding method. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (I) (In the formula, R represents an aliphatic saturated or unsaturated hydrocarbon group of C_8 to C_2_4, and A_1 is an aliphatic group, an alicyclic group, or an aromatic group. ) ▲There are mathematical formulas, chemical formulas, tables, etc. ▼ [II] (In the formula, R_3 is an aliphatic saturated or unsaturated hydrocarbon group of C_8 to C_2_4, and R_1 and R_2 are C_1 to C_
2_4 represents a saturated or unsaturated hydrocarbon group. ) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [III] (In the formula, R_4 is an aliphatic saturated or unsaturated hydrocarbon group of C_8 to C_2_4, A_2 is a saturated or unsaturated hydrocarbon group, alicyclic or refers to a divalent group that is aromatic and forms a cyclic imide, all or part of which has 6 or 5 ring atoms.) (3) The resin composition for injection molding according to claim 1, wherein the imide compound is used in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the polyol or polyether as the component (b). thing. (4) Production of a resin molded product according to claim 2, wherein the imide compound is used in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the polyol or polyether as the component (b). Method.